Nghe An Prov., Ky Son Distr., Na Ngoi Municipality, north-eastern slopes of Phu Xai Lai Leng mountain system.
Primary very humid broad-leaved forest with Cunninghamia konishii as emergent on steep mountain slopes composed of gray shale at elevation 2100-2200 m a.s.l. around point 19°13′52.9″N 104°05′30.5″E.
Undershrub 1-1.5 m tall on shady wet, very steep slope. Flowers purple. Locally abundant.